Chinese Academy of Sciences

Bao Qiu

Zhaoping Liu

Yonggao Xia

Yaletu Saixi

Qingwen Gu

Provided is a high-entropy positive electrode material, preparation method and application thereof. The high-entropy positive electrode material has a general formula as shown in the following formula: LiABCDOMN, wherein A is a metallic element having a valence of +2, B is a metallic element having a valence of +3, C is a metallic element having a valence of +4, D is a metallic element having a valence of +5, M is an element having a valence of +7, and N is an element having a valence of +8; and 0≤a<1, 0<x<1, 0<y<1, 0<z<1, 0<b<1, 0<c<1, d>0. This high-entropy positive electrode material is designed from the structure of the material itself. Compared with the conventional positive electrode materials, it has high specific discharge capacity and has a stable structure during the cycling without oxygen evolution.

High-entropy positive electrode material, preparation method and application thereof

A lithium-rich manganese-based positive electrode material represented by formula (I). In an X-ray diffraction pattern of the lithium-rich manganese-based positive electrode material, a ratio of a diffraction peak intensity of a Bragg angle near 18.7&#xb0; to a diffraction peak intensity of a Bragg angle near 44.6&#xb0; is 1.10 to 1.24. A method for preparing the lithium-rich manganese-based positive electrode material comprises: mixing a lithium-rich manganese-based compound with a lithium remover; and under the effect of the lithium remover, removing part of LiO from LiMnOin the lithium-rich manganese-based compound, so as to obtain the lithium-rich manganese-based positive electrode material. Due to the reduction of the irreversible product LiO, the initial coulombic efficiency is improved; because of existence of lithium vacancy and oxygen vacancy, the lithium-rich manganese-based positive electrode material has good rate performance and cycle performance.()LiMnOMnO(1&#x2212;)Li(MM')O&#x2003;&#x2003;(I)

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Bao Qiu